curran/.block

## .block
license: gpl-3.0
height: 960

## README.md

      
    Raw
  

              README.md
            
          
    Using d3-tile to display raster image tiles underneath some TopoJSON vectors. Compare to the zoomable version.
Tiles copyright OpenStreetMap contributors.
forked from mbostock's block: Raster & Vector I

  
## d3-tile.js
// https://d3js.org/d3-tile/ Version 0.0.3. Copyright 2016 Mike Bostock.
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-array')) :
  typeof define === 'function' && define.amd ? define(['exports', 'd3-array'], factory) :
  (factory((global.d3 = global.d3 || {}),global.d3));
}(this, function (exports,d3Array) { 'use strict';

  function tile() {
    var x0 = 0,
        y0 = 0,
        x1 = 960,
        y1 = 500,
        tx = (x0 + x1) / 2,
        ty = (y0 + y1) / 2,
        scale = 256,
        zoomDelta = 0,
        wrap = true;

    function tile() {
      var z = Math.max(Math.log(scale) / Math.LN2 - 8, 0),
          z0 = Math.round(z + zoomDelta),
          j = 1 << z0,
          k = Math.pow(2, z - z0 + 8),
          x = tx - scale / 2,
          y = ty - scale / 2,
          tiles = [],
          cols = d3Array.range(
            Math.max(wrap ? -Infinity : 0, Math.floor((x0 - x) / k)),
            Math.min(Math.ceil((x1 - x) / k), wrap ? Infinity : j)
          ),
          rows = d3Array.range(
            Math.max(0, Math.floor((y0 - y) / k)),
            Math.min(Math.ceil((y1 - y) / k), j)
          );

      rows.forEach(function(y) {
        cols.forEach(function(x) {
          var d = [(x % j + j) % j, y, z0];
          d.x = x * 256;
          d.y = y * 256;
          tiles.push(d);
        });
      });

      tiles.translate = [x / k, y / k];
      tiles.scale = k;
      return tiles;
    }

    tile.size = function(_) {
      return arguments.length ? (x0 = y0 = 0, x1 = +_[0], y1 = +_[1], tile) : [x1, y1];
    };

    tile.extent = function(_) {
      return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], tile) : [[x0, y0], [x1, y1]];
    };

    tile.scale = function(_) {
      return arguments.length ? (scale = +_, tile) : scale;
    };

    tile.translate = function(_) {
      return arguments.length ? (tx = +_[0], ty = +_[1], tile) : [tx, ty];
    };

    tile.zoomDelta = function(_) {
      return arguments.length ? (zoomDelta = +_, tile) : zoomDelta;
    };

    tile.wrap = function(_) {
      return arguments.length ? (wrap = _, tile) : wrap;
    };

    return tile;
  }

  exports.tile = tile;

  Object.defineProperty(exports, '__esModule', { value: true });

}));

## detroit.json

      
Display the source blob

    
Display the rendered blob

    
    Raw
  

              detroit.json
            
          
      Loading

      Sorry, something went wrong. Reload?
      Sorry, we cannot display this file.
      Sorry, this file is invalid so it cannot be displayed.
      
          Viewer requires iframe.
      
    
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

#streets {
  fill: none;
  stroke: black;
  stroke-width: 1.5px;
  stroke-linejoin: round;
}

</style>
<svg width="960" height="960"></svg>
<script src="//d3js.org/d3.v4.0.0-rc.1.min.js"></script>
<script src="d3-tile.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var pi = Math.PI,
    tau = 2 * pi;

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

var projection = d3.geoMercator()
    .scale((1 << 18) / tau)
    .translate([width / 2, height / 2])
    .center([-83.15, 42.43]);

var path = d3.geoPath()
    .projection(projection);

d3.json("detroit.json", function(error, detroit) {
  if (error) throw error;

  var tiles = d3.tile()
      .size([width, height])
      .scale(projection.scale() * tau)
      .translate(projection([0, 0]))
      ();

  svg.selectAll("image")
      .data(tiles)
    .enter().append("image")
      .attr("xlink:href", function(d) { return "http://" + "abc"[d[1] % 3] + ".tile.openstreetmap.org/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
      .attr("x", function(d) { return (d.x/tiles.scale + tiles.translate[0]) * tiles.scale; })
      .attr("y", function(d) { return (d.y/tiles.scale + tiles.translate[1]) * tiles.scale; })
      .attr("width", tiles.scale)
      .attr("height", tiles.scale);

  svg.append("path")
      .attr("id", "streets")
      .datum(topojson.mesh(detroit, detroit.objects.detroit))
      .attr("d", path);
});

</script>
	// https://d3js.org/d3-tile/ Version 0.0.3. Copyright 2016 Mike Bostock.
	(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-array')) :
	typeof define === 'function' && define.amd ? define(['exports', 'd3-array'], factory) :
	(factory((global.d3 = global.d3 \|\| {}),global.d3));
	}(this, function (exports,d3Array) { 'use strict';

	function tile() {
	var x0 = 0,
	y0 = 0,
	x1 = 960,
	y1 = 500,
	tx = (x0 + x1) / 2,
	ty = (y0 + y1) / 2,
	scale = 256,
	zoomDelta = 0,
	wrap = true;

	function tile() {
	var z = Math.max(Math.log(scale) / Math.LN2 - 8, 0),
	z0 = Math.round(z + zoomDelta),
	j = 1 << z0,
	k = Math.pow(2, z - z0 + 8),
	x = tx - scale / 2,
	y = ty - scale / 2,
	tiles = [],
	cols = d3Array.range(
	Math.max(wrap ? -Infinity : 0, Math.floor((x0 - x) / k)),
	Math.min(Math.ceil((x1 - x) / k), wrap ? Infinity : j)
	),
	rows = d3Array.range(
	Math.max(0, Math.floor((y0 - y) / k)),
	Math.min(Math.ceil((y1 - y) / k), j)
	);

	rows.forEach(function(y) {
	cols.forEach(function(x) {
	var d = [(x % j + j) % j, y, z0];
	d.x = x * 256;
	d.y = y * 256;
	tiles.push(d);
	});
	});

	tiles.translate = [x / k, y / k];
	tiles.scale = k;
	return tiles;
	}

	tile.size = function(_) {
	return arguments.length ? (x0 = y0 = 0, x1 = +_[0], y1 = +_[1], tile) : [x1, y1];
	};

	tile.extent = function(_) {
	return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], tile) : [[x0, y0], [x1, y1]];
	};

	tile.scale = function(_) {
	return arguments.length ? (scale = +_, tile) : scale;
	};

	tile.translate = function(_) {
	return arguments.length ? (tx = +_[0], ty = +_[1], tile) : [tx, ty];
	};

	tile.zoomDelta = function(_) {
	return arguments.length ? (zoomDelta = +_, tile) : zoomDelta;
	};

	tile.wrap = function(_) {
	return arguments.length ? (wrap = _, tile) : wrap;
	};

	return tile;
	}

	exports.tile = tile;

	Object.defineProperty(exports, '__esModule', { value: true });

	}));
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	#streets {
	fill: none;
	stroke: black;
	stroke-width: 1.5px;
	stroke-linejoin: round;
	}

	</style>
	<svg width="960" height="960"></svg>
	<script src="//d3js.org/d3.v4.0.0-rc.1.min.js"></script>
	<script src="d3-tile.js"></script>
	<script src="//d3js.org/topojson.v1.min.js"></script>
	<script>

	var pi = Math.PI,
	tau = 2 * pi;

	var svg = d3.select("svg"),
	width = +svg.attr("width"),
	height = +svg.attr("height");

	var projection = d3.geoMercator()
	.scale((1 << 18) / tau)
	.translate([width / 2, height / 2])
	.center([-83.15, 42.43]);

	var path = d3.geoPath()
	.projection(projection);

	d3.json("detroit.json", function(error, detroit) {
	if (error) throw error;

	var tiles = d3.tile()
	.size([width, height])
	.scale(projection.scale() * tau)
	.translate(projection([0, 0]))
	();

	svg.selectAll("image")
	.data(tiles)
	.enter().append("image")
	.attr("xlink:href", function(d) { return "http://" + "abc"[d[1] % 3] + ".tile.openstreetmap.org/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
	.attr("x", function(d) { return (d.x/tiles.scale + tiles.translate[0]) * tiles.scale; })
	.attr("y", function(d) { return (d.y/tiles.scale + tiles.translate[1]) * tiles.scale; })
	.attr("width", tiles.scale)
	.attr("height", tiles.scale);

	svg.append("path")
	.attr("id", "streets")
	.datum(topojson.mesh(detroit, detroit.objects.detroit))
	.attr("d", path);
	});

	</script>